The Low Energy Transmission Grating on Chandra (P.I.: A. Brinkman, SRON, Utrecht, with the collaboration of MPE, Garching) provides a spectral resolution of about 1000 in the 0.05-2 keV band (6-150 Angstrom). The dispersed spectrum is normally read out by the HRC-S.

Possible References:
Brinkman A.C., et al., 1997, SPIE, 3113, 181.
Predehl P., et al., 1997, SPIE, 3113, 172.

See the Proposers' Observatory Guide (POG) for more details.

The CXC LETG Calibration WWW pages have reports on the latest LETG calibration status.